Development of a Diffusion Mobility Database for Co-based Superalloys

Published

November 27, 2022

Author(s)

Greta Lindwall, Kil-Won Moon, Carelyn E. Campbell, Maureen E. Williams, Whitney Tso

Abstract

To facilitate the development of high-temperature Co-based - superalloys, a Co-Ni based diffusion mobility database is developed for the eight component FCC (Face Centered Cubic) system of Co-Al-W-Ni-Cr-Ti-Ta-Re. A CALPHAD approach is used to represent the temperature and composition dependency of the multicomponent system. The mobility descriptions are based on previous assessment work for the Ni-based superalloys, published experimental and computational data, and established diffusion correlations. The initial mobility descriptions were then refined using additional diffusion couple experimental data, particularly for the Co-Cr, Co-Ta, and Ni-Ta systems. After re-optimizing the descriptions with the new experimental data, the mobility descriptions were validated using a collection of published diffusion couple composition profiles, which were not included in the initial assessment process.

Citation

Journal of Phase Equilibria and Diffusion

Volume

43

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s11669-022-01011-1

Local Download

Keywords

Co-based superalloys, diffusion, CALPHAD

Citation

Lindwall, G. , Moon, K. , Campbell, C. , Williams, M. and Tso, W. (2022), Development of a Diffusion Mobility Database for Co-based Superalloys, Journal of Phase Equilibria and Diffusion, [online], https://doi.org/10.1007/s11669-022-01011-1, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935295 (Accessed October 17, 2025)